Ключевые слова: background, business, caution, concept, concrete, construction, danger, digger, digging, engineer, figure, floor, ground, hard, hardhat, helmet, holding, implement, isolated, job, label, little, male, man, message, model, notice, occupation, outdoor, person, plan, power, progress, project, repair, responsibility, road, safety, sign, site, small, street, symbol, under, wages, warning, white, work, worker, yellow,